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对于特殊复杂的地质条件以及对变形要求较高的地下工程,扩大头预应力锚索有效利用扩大头前端土体抗力,提高锚索的承载能力和支护结构的抗变形能力,是一种较为理想的支护方式。扩大头锚索的理论研究与设计滞后于工程经验,基于弹性理论,通过研究扩大头前端土体受力状态与土压力的关系以及锚固土体接触面的应力状态,分析了土层变形过程中锚索的受力特性,建立了扩大头预应力锚索在土体变形过程中的力学模型,通过实例验证了公式的适用性,为研究与评估施工过程中扩大头锚索的整体受力情况提供了新的思路。
For special complex geological conditions and deformation of underground engineering requirements, the expansion of prestressed anchor cable effectively expand the resistance of the soil at the front of the head to improve the carrying capacity of the anchor and the anti-deformation of the support structure is a The ideal way to support. Based on the theory of elasticity, the theoretical research and design of the enlarged head anchor cable lags behind the engineering experience. Based on the study of the relationship between the stress state of the soil head and the earth pressure and the stress state at the contact surface of the anchor head, The mechanical model of expanding the head prestressed anchor cable in the process of soil deformation was established. The applicability of the formula was verified by an example. In order to study and evaluate the overall stress of expanding the head cable during construction, Provide a new way of thinking.